I _____ some washing when you called me last night.( )
A.was doingB.am doingC.were doing
I came to school ____ this morning because it was my turn to clean our classroom.( )
A.earlyB.slowlyC.quietlyD.suddenly
The villagers expect that the building of the bridge ____ before the rainy season comes.( )
A.is completedB.was completed
C.will be completedD.has been completed
﹣Shall we go to the airport to ___ your sister?
﹣I don't think it's necessary. She will come here by taxi.( )
A.see offB.pick up
C.look afterD.come across
﹣I wonder ____ the students have a physical examination.
﹣Once a year.( )
A.how farB.how soonC.how longD.how often
The designer has tried every possible way to make the robot light, so you _____ worry about its weight.( )
A.mustB.mayC.can'tD.needn't